Application of landscape metrics and object-oriented remote sensing to detect the spatial arrangement of agricultural land

• Authors: Rezvan Safdary , Alireza Soffianian , Saeid Pourmanafi

Abstracts

EN

This study aims to investigate crop selection and spatial patterns of agricultural fields in a drought-affected region in Isfahan Province, central Iran. Based on field surveys portraying growth stages of the main crops including wheat, alfalfa, vegetables and fruit trees, three Landsat 8 operational land imager (OLI) images were acquired on March 15 (L1), June 27 (L2) and October 1 (L3), 2015. After performing radiometric and atmospheric corrections, Normalized Difference Vegetation Index (NDVI) maps of the images were produced and introduced to the Multi-Resolution Segmentation algorithm to delineate agricultural fields. An NDVI-based decision algorithm was then developed to identify crops devoted to each field. Finally, a set of landscape metrics including Number of Patches (NP), mean patch size (MPS), mean shape index (MSI), perimeter-to-area ratio (PARA) and Euclidian Nearest Neighborhood Distance (ENN) was utilized to evaluate their respective spatial formation. The results showed that nearly 46% of fields are devoted to wheat indicating that the landscape has been dramatically shifted towards wheat monoculture farming. Moreover, the farmers’ inclination to grow crops in large fields (approximate area of 1 ha) with more regular geometric shapes are considered as an effective way of optimising water use efficiency in areas experiencing significant water shortage.

Keywords

EN

crop type; segmentation; landscape metrics; Iran

• Publisher: Uniwersytet im. Adama Mickiewicza w Poznaniu
• Journal: Quaestiones Geographicae
• Year: 2022
• Volume: 41
• Issue: 1
• Pages: 25-35

Dates

published

2022

Contributors

author

Rezvan Safdary

• Department of Environment, Faculty of Natural resources and Environment, Science and Research Branch, Islamic Azad University, Tehran, Iran

• https://orcid.org/0000000348345908

author

Alireza Soffianian

• Department of Environmental Sciences, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran

• https://orcid.org/0000000159931369

author

Saeid Pourmanafi

• Department of Environmental Sciences, Faculty of Natural Resources, Isfahan University of Technology, Isfahan, Iran

• https://orcid.org/0000000299686449

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Identifiers

DOI

10.2478/quageo-2022-0002

Biblioteka Nauki

2054571